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a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=3I1J8UUJPc9JN9BFgKH3:22 a=NEAV23lmAAAA:8 a=lCAI_TF8MS3fePEP-7wA:9 a=PRpDppDLrCsA:10 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODMxMDA3MyBTYWx0ZWRfX0zI6IevRTE/I Y6sUpUGcEOZncFKj/IJ5XYjCUueqpJFlWltlKR9kjiaR6bBGAX0dB23MU3MDVaEZc0wm8t/1Pan l+AWyvkeWs5sSifs1BGuSj9uQfwbO85LolN0LoseaxBP3YSqPS85W1ZVmS3ltJoT/Md3tsfKdet mszWRxltwEjY8oZAceCwsjal/ZLG/aFtVbUpRUMmEqx6fCSWSF5XcvmpLIU09rWGuLs/6DLz3Sl VtvSkpDfMnTS1+AnKhF0U4IEao+IY3uv//RK/rJoLulaHENVjncRh30pdO6obWM5bs+zO4EOo9S xhMCr6cswMSVqN2InsUR8tSZzvl0PWAi919zubGOGpXLEiDmsSliOO7baY3yhUZ78R8Xjlp2QSu SYAgmtIVXgoGRl7EcLDBgQQt67XtyGcTVRsH+5eWinMGLz1TrC2nyMxmZR13NEfdstBFZ/bCwBf pIrj5JYyksUIieta5Pg== X-Proofpoint-Spam-Info: AW1haW4tMjYwODMxMDA3MyBTYWx0ZWRfX9CgF8sZOjnbi 9nZsOufbB0id6ccxajtxUudRjyJM/Y/tzabgasysak+8MW9R1AC6CR5xXFeqnknd5Q3qgHLoRHS mfgTg4XE21IKTjZprpllWsE1gfCtb5lNroqbSCilfx1NaChv67kX X-Proofpoint-ORIG-GUID: jo_JmbLbgoxn6NAwyE2bfkDEe6OyS_97 X-Proofpoint-GUID: jo_JmbLbgoxn6NAwyE2bfkDEe6OyS_97 On 27/08/2026 17:17, Jörg Rödel wrote: > Hi, I just pushed out new branches for COCONUT-SVSMs downstream Linux > and QEMU changes. The new branches need to be used together, as there > have been rebases which changed parts of the user-space interface. For > Linux the branch is: https: //github. com/coconut-svsm/linux/tree/svsm-v7. 2 > On a system that was running the 7.1 branches, I've upgraded the host kernel and qemu to the 7.2 branches and am now getting CPU stalls in the guest (and eventual boot hang). I'm using ./scripts/launch_guest.sh (and 2026.08-devel) One thing I've noticed with kvm_stat is that the top host functions are Event Total %Total CurAvg/s kvm_set_irq 2304824 22.2 2095 kvm_ioapic_set_irq 2304824 22.2 2095 kvm_pic_set_irq 2304768 22.2 2095 kvm_exit 626814 6.0 159 kvm_entry 626814 6.0 159 kvm_vmgexit_exit 299778 2.9 105 kvm_vmgexit_enter 299777 2.9 105 (...) Are there any new kernel boot args needed for host or guest kernels? I've confirmed that regular SEV-SNP guest (VMPL0) still launches OK with the same components. I've also tried dropping the last Regards, Liam FWIW, sample guest stall stack. [ 1230.794758] INFO: task kworker/u16:0:12 blocked for more than 122 seconds. [ 1230.796595] Not tainted 7.2.0-0.svsm.6.el9uek.rc.x86_64 #1 [ 1230.798135] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1230.800083] task:kworker/u16:0 state:D stack:0 pid:12 tgid:12 ppid:2 task_flags:0x4208060 flags:0x00080000 [ 1230.802818] Workqueue: async async_run_entry_fn [ 1230.803993] Call Trace: [ 1230.804646] [ 1230.805250] __schedule+0x2b1/0x6d0 [ 1230.806178] schedule+0x27/0xa0 [ 1230.807014] async_synchronize_cookie_domain+0x125/0x16c [ 1230.808354] ? __pfx_autoremove_wake_function+0x10/0x10 [ 1230.809708] async_port_probe+0x3d/0x60 [libata] [ 1230.810923] async_run_entry_fn+0x34/0x140 [ 1230.812009] process_one_work+0x196/0x35e [ 1230.813054] worker_thread+0x1af/0x330 [ 1230.814039] ? __pfx_worker_thread+0x10/0x10 [ 1230.815144] kthread+0xe3/0x120 [ 1230.815982] ? __pfx_kthread+0x10/0x10 [ 1230.816956] ret_from_fork+0x1ab/0x270 [ 1230.817961] ? __pfx_kthread+0x10/0x10 [ 1230.818949] ret_from_fork_asm+0x1a/0x30 [ 1230.819973] > Hi, > > I just pushed out new branches for COCONUT-SVSMs downstream Linux and QEMU > changes. The new branches need to be used together, as there have been rebases > which changed parts of the user-space interface. For Linux the branch is: > > https://github.com/coconut-svsm/linux/tree/svsm-v7.2 > > For QEMU: > > https://github.com/coconut-svsm/qemu/tree/svsm-v7.2 > > These new branches bring a set of changes and new features: > > - KVM planes patches rebased to v7.2 > > - QEMU patches rewritten on v11.1.0 > > - Support for KVM planes with in-kernel IOAPIC/PIC/PIT/RTC > > - Support for PCI device assignment with KVM planes > > - Use of version 2 of the direct-VMSA patch-set > > The last point deserves closer attention, as it will lead to a breaking change > going forward. The new version of the direct-VMSA patch-set requires a valid > VMSA GPA to be passed to KVM. The currently used GPA (0xFFFF_FFFF_F000) is NOT > a valid GPA. > > For now QEMU will fall back to legacy behavior when it finds an invalid GPA in > the IGVM file, so everything keeps booting as ususal, except that the launch > measurement will not match anymore. > > This can be easily fixed in the SVSM and I have a draft-PR open for that: > > https://github.com/coconut-svsm/svsm/pull/1209 > > This PR moves the VMSA page into guest memory for QEMU, just like it is on > Hyper-V. The problem with that PR is that is breaks all existing Linux/QEMU > combinations, as they all have strict checks for the VMSA GPA to be a > 0xFFFF_FFFF_F000. > > My plan forward here is to switch to the new 7.2-based branches after everyone > had enough time to test them. After switching there will be even more time for > everyone else to switch over to the new downstream code. And only after that we > will merge PR #1209. > > This is not an ideal situation and I'd like to have avoided more breaking > changes. But in this case I believe it is justified as avoiding this needs ugly > changes in the KVM direct-vmsa patch-set. > > With that in mind I wish everyone happy testing. Please report any issues you > might find so that they can be fixed. > > Regards, > > Joerg >